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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1102 | * key value, respectively. |
| 1103 | * |
| 1104 | * @since 3.3.0 |
| 1105 | * |
| 1106 | * @param mixed $meta_value Metadata value to sanitize. |
| 1107 | * @param string $meta_key Metadata key. |
| 1108 | * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', |
| 1109 | * or any other object type with an associated meta table. |
| 1110 | */ |
| 1111 | return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); |
| 1112 | } |
| 1113 | |
| 1114 | /** |
| 1115 | * Registers a meta key. |
| 1116 | * |
| 1117 | * It is recommended to register meta keys for a specific combination of object type and object subtype. If passing |
| 1118 | * an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly |
| 1119 | * overridden in case a more specific meta key of the same name exists for the same object type and a subtype. |
| 1120 | * |